Hey @nambirajanks,
If it’s not an ecommerce store, does the store have a third-party app that’s connected to manage the subscriptions users purchase? If so, then you’ll want to connect that app to Klaviyo in order for those purchase data to be synced.
I would suggest checking to see if that app has developed their own integrated to be connected to your Klaviyo account. Else, you’ll want to pass those subscription and purchase information to Klaviyo using a custom connection.
I think taking a look at both our Integrate a platform without a pre-built Klaviyo integration and Integrate a subscription ecommerce platform Developer Guides may be useful in this case. Don’t forget, if you need the help of a developer to set this up, we have an expansive network of Klaviyo Partners who you can work alongside to get this going.
David